From https://gstreamer.freedesktop.org/src/gst-libav/gst-libav-1.12.2.tar.xz.sha256sum
sha256 5bb735b9bb218b652ae4071ea6f6be8eaae55e9d3233aec2f36b882a27542db3 gst-libav-1.12.2.tar.xz
